Mesonephros

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

The mesonephros (Greek: middle kidney) is one of three excretory organs that develop in vertebrates. It serves as the main excretory organ of aquatic vertebrates and as a temporary kidney in reptiles, birds, and mammals.

Excerpt from the Wikipedia article “Mesonephros”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: PaulT (Gunther Tschuch), CC BY-SA 4.0, via Wikimedia Commons.